P0AE8: Hybrid/EV Battery Temperature Sensor D Circuit
What to do
As P0A9B — wiring first, and the neighbours usually convict the right sensor before anything is opened.
What this code means
The fourth cell temperature sensor has failed its circuit checks — the last of the lettered positions, closing the family P0A9B opened. Same argument, same diagnosis, same neighbour cross-check identifying the liar; the letter says only where in the pack it sits.
Likely causes
Start here
- Open circuit in sensor wiring · moderate
- Corroded or loose connector · easy
Less common
- Faulty battery temperature sensor · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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